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40 lines
1.5 KiB
JavaScript
40 lines
1.5 KiB
JavaScript
// Insert this script in your index.html right after the <body> tag.
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// This will help to prevent a flash if dark mode is the default.
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(function() {
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// Change these if you use something different in your hook.
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var storageKey = 'darkMode';
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var classNameDark = 'dark-mode';
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var classNameLight = 'light-mode';
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function setClassOnDocumentBody(darkMode) {
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document.body.classList.add(darkMode ? classNameDark : classNameLight);
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document.body.classList.remove(darkMode ? classNameLight : classNameDark);
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}
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var preferDarkQuery = '(prefers-color-scheme: dark)';
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var mql = window.matchMedia(preferDarkQuery);
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var supportsColorSchemeQuery = mql.media === preferDarkQuery;
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var localStorageTheme = null;
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try {
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localStorageTheme = localStorage.getItem(storageKey);
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} catch (err) {}
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var localStorageExists = localStorageTheme !== null;
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if (localStorageExists) {
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localStorageTheme = JSON.parse(localStorageTheme);
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}
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// Determine the source of truth
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if (localStorageExists) {
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// source of truth from localStorage
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setClassOnDocumentBody(localStorageTheme);
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} else if (supportsColorSchemeQuery) {
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// source of truth from system
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setClassOnDocumentBody(mql.matches);
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localStorage.setItem(storageKey, mql.matches);
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} else {
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// source of truth from document.body
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var isDarkMode = document.body.classList.contains(classNameDark);
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localStorage.setItem(storageKey, JSON.stringify(isDarkMode));
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}
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})(); |